113 lines
3.4 KiB
Plaintext
113 lines
3.4 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 an AND 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_and_rhs
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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_and_rhs
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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]], 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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%fold_cst:gpr(s64) = G_CONSTANT i64 8
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; tbnz (and x, 8), 3 == tbnz x, 3 because the third bit of x & 8 is 1 when
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; the third bit of x is 1.
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%fold_me:gpr(s64) = G_AND %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_and_lhs
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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_and_lhs
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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]], 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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%fold_cst:gpr(s64) = G_CONSTANT i64 8
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; Same as above, but with the constant on the other side.
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%fold_me:gpr(s64) = G_AND %fold_cst, %copy
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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_and
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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_and
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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:gpr64sp = ANDXri %copy, 4098
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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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; tbnz (and x, 7), 3 != tbnz x, 3, because the third bit of x & 7 is always
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; zero.
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%fold_cst:gpr(s64) = G_CONSTANT i64 7
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%fold_me:gpr(s64) = G_AND %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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