400 lines
11 KiB
Plaintext
400 lines
11 KiB
Plaintext
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# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
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# RUN: llc -mtriple aarch64-unknown-unknown -run-pass=instruction-select -verify-machineinstrs %s -o - | FileCheck %s
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#
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# Check folding a G_SHL into a G_BRCOND which has been matched as a TB(N)Z.
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...
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---
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name: fold_shl
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alignment: 4
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legalized: true
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regBankSelected: true
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body: |
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; CHECK-LABEL: name: fold_shl
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; CHECK: bb.0:
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; CHECK: successors: %bb.0(0x40000000), %bb.1(0x40000000)
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; CHECK: %copy:gpr64all = COPY $x0
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; CHECK: [[COPY:%[0-9]+]]:gpr32all = COPY %copy.sub_32
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; CHECK: [[COPY1:%[0-9]+]]:gpr32 = COPY [[COPY]]
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; CHECK: TBNZW [[COPY1]], 2, %bb.1
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; CHECK: B %bb.0
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; CHECK: bb.1:
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; CHECK: RET_ReallyLR
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bb.0:
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successors: %bb.0, %bb.1
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liveins: $x0
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%copy:gpr(s64) = COPY $x0
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%bit:gpr(s64) = G_CONSTANT i64 8
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%zero:gpr(s64) = G_CONSTANT i64 0
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; tbnz (shl x, 1), 3 == tbnz x, 2
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%fold_cst:gpr(s64) = G_CONSTANT i64 1
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%fold_me:gpr(s64) = G_SHL %copy, %fold_cst
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%and:gpr(s64) = G_AND %fold_me, %bit
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%cmp:gpr(s32) = G_ICMP intpred(ne), %and(s64), %zero
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%cmp_trunc:gpr(s1) = G_TRUNC %cmp(s32)
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G_BRCOND %cmp_trunc(s1), %bb.1
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G_BR %bb.0
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bb.1:
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RET_ReallyLR
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...
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---
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name: dont_fold_shl_1
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alignment: 4
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legalized: true
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regBankSelected: true
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body: |
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; CHECK-LABEL: name: dont_fold_shl_1
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; CHECK: bb.0:
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; CHECK: successors: %bb.0(0x40000000), %bb.1(0x40000000)
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; CHECK: %copy:gpr64 = COPY $x0
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; CHECK: %fold_me:gpr64 = UBFMXri %copy, 59, 58
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; CHECK: [[COPY:%[0-9]+]]:gpr32all = COPY %fold_me.sub_32
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; CHECK: [[COPY1:%[0-9]+]]:gpr32 = COPY [[COPY]]
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; CHECK: TBNZW [[COPY1]], 3, %bb.1
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; CHECK: B %bb.0
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; CHECK: bb.1:
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; CHECK: RET_ReallyLR
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bb.0:
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successors: %bb.0, %bb.1
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liveins: $x0
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%copy:gpr(s64) = COPY $x0
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%bit:gpr(s64) = G_CONSTANT i64 8
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%zero:gpr(s64) = G_CONSTANT i64 0
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; 5 > 3, so we cannot do the transformation as above.
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%fold_cst:gpr(s64) = G_CONSTANT i64 5
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%fold_me:gpr(s64) = G_SHL %copy, %fold_cst
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%and:gpr(s64) = G_AND %fold_me, %bit
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%cmp:gpr(s32) = G_ICMP intpred(ne), %and(s64), %zero
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%cmp_trunc:gpr(s1) = G_TRUNC %cmp(s32)
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G_BRCOND %cmp_trunc(s1), %bb.1
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G_BR %bb.0
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bb.1:
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RET_ReallyLR
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...
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---
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name: dont_fold_shl_2
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alignment: 4
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legalized: true
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regBankSelected: true
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body: |
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; CHECK-LABEL: name: dont_fold_shl_2
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; CHECK: bb.0:
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; CHECK: successors: %bb.0(0x40000000), %bb.1(0x40000000)
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; CHECK: %copy:gpr64 = COPY $x0
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; CHECK: %fold_cst:gpr64 = MOVi64imm -5
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; CHECK: %fold_me:gpr64 = LSLVXr %copy, %fold_cst
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; CHECK: [[COPY:%[0-9]+]]:gpr32all = COPY %fold_me.sub_32
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; CHECK: [[COPY1:%[0-9]+]]:gpr32 = COPY [[COPY]]
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; CHECK: TBNZW [[COPY1]], 3, %bb.1
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; CHECK: B %bb.0
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; CHECK: bb.1:
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; CHECK: RET_ReallyLR
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bb.0:
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successors: %bb.0, %bb.1
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liveins: $x0
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%copy:gpr(s64) = COPY $x0
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%bit:gpr(s64) = G_CONSTANT i64 8
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%zero:gpr(s64) = G_CONSTANT i64 0
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; Same case as above, except we wrap around.
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%fold_cst:gpr(s64) = G_CONSTANT i64 -5
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%fold_me:gpr(s64) = G_SHL %copy, %fold_cst
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%and:gpr(s64) = G_AND %fold_me, %bit
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%cmp:gpr(s32) = G_ICMP intpred(ne), %and(s64), %zero
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%cmp_trunc:gpr(s1) = G_TRUNC %cmp(s32)
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G_BRCOND %cmp_trunc(s1), %bb.1
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G_BR %bb.0
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bb.1:
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RET_ReallyLR
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...
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---
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name: dont_fold_shl_3
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alignment: 4
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legalized: true
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regBankSelected: true
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body: |
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; CHECK-LABEL: name: dont_fold_shl_3
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; CHECK: bb.0:
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; CHECK: successors: %bb.0(0x40000000), %bb.1(0x40000000)
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; CHECK: %copy:gpr64 = COPY $x0
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; CHECK: %shl:gpr64 = UBFMXri %copy, 62, 61
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; CHECK: [[COPY:%[0-9]+]]:gpr32all = COPY %shl.sub_32
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; CHECK: [[COPY1:%[0-9]+]]:gpr32 = COPY [[COPY]]
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; CHECK: TBNZW [[COPY1]], 3, %bb.1
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; CHECK: B %bb.0
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; CHECK: bb.1:
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; CHECK: %second_use:gpr64sp = ORRXri %shl, 8000
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; CHECK: $x0 = COPY %second_use
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; CHECK: RET_ReallyLR implicit $x0
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bb.0:
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successors: %bb.0, %bb.1
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liveins: $x0
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%copy:gpr(s64) = COPY $x0
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%bit:gpr(s64) = G_CONSTANT i64 8
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%zero:gpr(s64) = G_CONSTANT i64 0
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%fold_cst:gpr(s64) = G_CONSTANT i64 2
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; Don't walk past the G_SHL when it's used more than once.
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%shl:gpr(s64) = G_SHL %copy, %fold_cst
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%and:gpr(s64) = G_AND %shl, %bit
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%cmp:gpr(s32) = G_ICMP intpred(ne), %and(s64), %zero
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%cmp_trunc:gpr(s1) = G_TRUNC %cmp(s32)
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G_BRCOND %cmp_trunc(s1), %bb.1
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G_BR %bb.0
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bb.1:
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%second_use:gpr(s64) = G_OR %shl, %bit
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$x0 = COPY %second_use
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RET_ReallyLR implicit $x0
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...
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---
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name: fold_ashr_in_range
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alignment: 4
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legalized: true
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regBankSelected: true
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body: |
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; CHECK-LABEL: name: fold_ashr_in_range
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; CHECK: bb.0:
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; CHECK: successors: %bb.0(0x40000000), %bb.1(0x40000000)
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; CHECK: %copy:gpr64all = COPY $x0
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; CHECK: [[COPY:%[0-9]+]]:gpr32all = COPY %copy.sub_32
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; CHECK: [[COPY1:%[0-9]+]]:gpr32 = COPY [[COPY]]
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; CHECK: TBNZW [[COPY1]], 4, %bb.1
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; CHECK: B %bb.0
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; CHECK: bb.1:
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; CHECK: RET_ReallyLR
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bb.0:
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successors: %bb.0, %bb.1
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liveins: $x0
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%copy:gpr(s64) = COPY $x0
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%bit:gpr(s64) = G_CONSTANT i64 8
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%zero:gpr(s64) = G_CONSTANT i64 0
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; tb(n)z (ashr x, c), b == tbz(x, b + c) when b+c <= the size of the type.
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; In this case, we should get 1 + 3 = 4 as the bit number.
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%fold_cst:gpr(s64) = G_CONSTANT i64 1
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%fold_me:gpr(s64) = G_ASHR %copy, %fold_cst
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%and:gpr(s64) = G_AND %fold_me, %bit
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%cmp:gpr(s32) = G_ICMP intpred(ne), %and(s64), %zero
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%cmp_trunc:gpr(s1) = G_TRUNC %cmp(s32)
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G_BRCOND %cmp_trunc(s1), %bb.1
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G_BR %bb.0
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bb.1:
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RET_ReallyLR
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...
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---
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name: fold_ashr_msb_1
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alignment: 4
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legalized: true
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regBankSelected: true
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body: |
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; CHECK-LABEL: name: fold_ashr_msb_1
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; CHECK: bb.0:
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; CHECK: successors: %bb.0(0x40000000), %bb.1(0x40000000)
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; CHECK: %copy:gpr32 = COPY $w0
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; CHECK: TBNZW %copy, 31, %bb.1
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; CHECK: B %bb.0
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; CHECK: bb.1:
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; CHECK: RET_ReallyLR
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bb.0:
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successors: %bb.0, %bb.1
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liveins: $x0
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%copy:gpr(s32) = COPY $w0
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%bit:gpr(s32) = G_CONSTANT i32 8
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%zero:gpr(s32) = G_CONSTANT i32 0
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; We should get a TBNZW with a 31 as the bit.
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%fold_cst:gpr(s32) = G_CONSTANT i32 1234
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%fold_me:gpr(s32) = G_ASHR %copy, %fold_cst
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%and:gpr(s32) = G_AND %fold_me, %bit
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%cmp:gpr(s32) = G_ICMP intpred(ne), %and(s32), %zero
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%cmp_trunc:gpr(s1) = G_TRUNC %cmp(s32)
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G_BRCOND %cmp_trunc(s1), %bb.1
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G_BR %bb.0
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bb.1:
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RET_ReallyLR
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...
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---
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name: fold_ashr_msb_2
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alignment: 4
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legalized: true
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regBankSelected: true
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body: |
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; CHECK-LABEL: name: fold_ashr_msb_2
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; CHECK: bb.0:
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; CHECK: successors: %bb.0(0x40000000), %bb.1(0x40000000)
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; CHECK: %copy:gpr64 = COPY $x0
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; CHECK: TBNZX %copy, 63, %bb.1
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; CHECK: B %bb.0
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; CHECK: bb.1:
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; CHECK: RET_ReallyLR
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bb.0:
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successors: %bb.0, %bb.1
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liveins: $x0
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%copy:gpr(s64) = COPY $x0
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%bit:gpr(s64) = G_CONSTANT i64 8
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%zero:gpr(s64) = G_CONSTANT i64 0
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; We should get a TBNZX with a 63 as the bit.
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%fold_cst:gpr(s64) = G_CONSTANT i64 1234
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%fold_me:gpr(s64) = G_ASHR %copy, %fold_cst
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%and:gpr(s64) = G_AND %fold_me, %bit
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%cmp:gpr(s32) = G_ICMP intpred(ne), %and(s64), %zero
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%cmp_trunc:gpr(s1) = G_TRUNC %cmp(s32)
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G_BRCOND %cmp_trunc(s1), %bb.1
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G_BR %bb.0
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bb.1:
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RET_ReallyLR
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...
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---
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name: fold_lshr
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alignment: 4
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legalized: true
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regBankSelected: true
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body: |
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; CHECK-LABEL: name: fold_lshr
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; CHECK: bb.0:
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; CHECK: successors: %bb.0(0x40000000), %bb.1(0x40000000)
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; CHECK: %copy:gpr32 = COPY $w0
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; CHECK: TBNZW %copy, 4, %bb.1
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; CHECK: B %bb.0
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; CHECK: bb.1:
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; CHECK: RET_ReallyLR
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bb.0:
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successors: %bb.0, %bb.1
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liveins: $x0
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%copy:gpr(s32) = COPY $w0
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%bit:gpr(s32) = G_CONSTANT i32 8
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%zero:gpr(s32) = G_CONSTANT i32 0
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; We should get 4 as the test bit.
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%fold_cst:gpr(s32) = G_CONSTANT i32 1
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%fold_me:gpr(s32) = G_LSHR %copy, %fold_cst
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%and:gpr(s32) = G_AND %fold_me, %bit
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%cmp:gpr(s32) = G_ICMP intpred(ne), %and(s32), %zero
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%cmp_trunc:gpr(s1) = G_TRUNC %cmp(s32)
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G_BRCOND %cmp_trunc(s1), %bb.1
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G_BR %bb.0
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bb.1:
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RET_ReallyLR
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...
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---
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name: fold_lshr_2
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alignment: 4
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legalized: true
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regBankSelected: true
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body: |
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; CHECK-LABEL: name: fold_lshr_2
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; CHECK: bb.0:
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; CHECK: successors: %bb.0(0x40000000), %bb.1(0x40000000)
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; CHECK: %copy:gpr64 = COPY $x0
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; CHECK: TBNZX %copy, 32, %bb.1
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; CHECK: B %bb.0
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; CHECK: bb.1:
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; CHECK: RET_ReallyLR
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bb.0:
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successors: %bb.0, %bb.1
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liveins: $x0
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%copy:gpr(s64) = COPY $x0
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%bit:gpr(s64) = G_CONSTANT i64 8
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%zero:gpr(s64) = G_CONSTANT i64 0
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; We're testing a s64.
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; 3 + 29 = 32, which is less than 63, so we can fold.
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%fold_cst:gpr(s64) = G_CONSTANT i64 29
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%fold_me:gpr(s64) = G_LSHR %copy, %fold_cst
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%and:gpr(s64) = G_AND %fold_me, %bit
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%cmp:gpr(s32) = G_ICMP intpred(ne), %and(s64), %zero
|
||
|
|
%cmp_trunc:gpr(s1) = G_TRUNC %cmp(s32)
|
||
|
|
G_BRCOND %cmp_trunc(s1), %bb.1
|
||
|
|
G_BR %bb.0
|
||
|
|
bb.1:
|
||
|
|
RET_ReallyLR
|
||
|
|
|
||
|
|
...
|
||
|
|
---
|
||
|
|
name: dont_fold_lshr
|
||
|
|
alignment: 4
|
||
|
|
legalized: true
|
||
|
|
regBankSelected: true
|
||
|
|
body: |
|
||
|
|
; CHECK-LABEL: name: dont_fold_lshr
|
||
|
|
; CHECK: bb.0:
|
||
|
|
; CHECK: successors: %bb.0(0x40000000), %bb.1(0x40000000)
|
||
|
|
; CHECK: %copy:gpr32 = COPY $w0
|
||
|
|
; CHECK: %fold_cst:gpr32 = MOVi32imm 29
|
||
|
|
; CHECK: %fold_me:gpr32 = LSRVWr %copy, %fold_cst
|
||
|
|
; CHECK: TBNZW %fold_me, 3, %bb.1
|
||
|
|
; CHECK: B %bb.0
|
||
|
|
; CHECK: bb.1:
|
||
|
|
; CHECK: RET_ReallyLR
|
||
|
|
bb.0:
|
||
|
|
successors: %bb.0, %bb.1
|
||
|
|
liveins: $x0
|
||
|
|
%copy:gpr(s32) = COPY $w0
|
||
|
|
%bit:gpr(s32) = G_CONSTANT i32 8
|
||
|
|
%zero:gpr(s32) = G_CONSTANT i32 0
|
||
|
|
|
||
|
|
; We're testing a s32.
|
||
|
|
; 3 + 29 = 32, which is greater than 31, so we don't fold.
|
||
|
|
%fold_cst:gpr(s32) = G_CONSTANT i32 29
|
||
|
|
%fold_me:gpr(s32) = G_LSHR %copy, %fold_cst
|
||
|
|
|
||
|
|
%and:gpr(s32) = G_AND %fold_me, %bit
|
||
|
|
%cmp:gpr(s32) = G_ICMP intpred(ne), %and(s32), %zero
|
||
|
|
%cmp_trunc:gpr(s1) = G_TRUNC %cmp(s32)
|
||
|
|
G_BRCOND %cmp_trunc(s1), %bb.1
|
||
|
|
G_BR %bb.0
|
||
|
|
bb.1:
|
||
|
|
RET_ReallyLR
|
||
|
|
|
||
|
|
...
|
||
|
|
---
|
||
|
|
name: lshr_negative
|
||
|
|
alignment: 4
|
||
|
|
legalized: true
|
||
|
|
regBankSelected: true
|
||
|
|
body: |
|
||
|
|
; CHECK-LABEL: name: lshr_negative
|
||
|
|
; CHECK: bb.0:
|
||
|
|
; CHECK: successors: %bb.0(0x40000000), %bb.1(0x40000000)
|
||
|
|
; CHECK: %copy:gpr32 = COPY $w0
|
||
|
|
; CHECK: TBNZW %copy, 2, %bb.1
|
||
|
|
; CHECK: B %bb.0
|
||
|
|
; CHECK: bb.1:
|
||
|
|
; CHECK: RET_ReallyLR
|
||
|
|
bb.0:
|
||
|
|
successors: %bb.0, %bb.1
|
||
|
|
liveins: $x0
|
||
|
|
%copy:gpr(s32) = COPY $w0
|
||
|
|
%bit:gpr(s32) = G_CONSTANT i32 8
|
||
|
|
%zero:gpr(s32) = G_CONSTANT i32 0
|
||
|
|
|
||
|
|
; Constant becomes very large and wraps around. Since it's larger than the
|
||
|
|
; bit width, that means the LSHR is poison, so we can still fold.
|
||
|
|
%fold_cst:gpr(s32) = G_CONSTANT i32 -1
|
||
|
|
%fold_me:gpr(s32) = G_LSHR %copy, %fold_cst
|
||
|
|
|
||
|
|
%and:gpr(s32) = G_AND %fold_me, %bit
|
||
|
|
%cmp:gpr(s32) = G_ICMP intpred(ne), %and(s32), %zero
|
||
|
|
%cmp_trunc:gpr(s1) = G_TRUNC %cmp(s32)
|
||
|
|
G_BRCOND %cmp_trunc(s1), %bb.1
|
||
|
|
G_BR %bb.0
|
||
|
|
bb.1:
|
||
|
|
RET_ReallyLR
|