107 lines
4.1 KiB
LLVM
107 lines
4.1 KiB
LLVM
; RUN: llc -verify-machineinstrs -mtriple=powerpc64le-unknown-linux-gnu < %s | FileCheck %s
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; The instructions ADDIStocHA8/LDtocL are used to calculate the address of
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; globals. The ones that are in bb.3.if.end could not be hoisted by Machine
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; LICM due to BCTRL_LDinto_toc in bb2.if.then. This call causes the compiler
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; to insert a save TOC to stack before the call and load into X2 to restore TOC
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; after. By communicating to Machine LICM that X2 is guaranteed to have the
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; same value before and after BCTRL_LDinto_toc, these instructions can be
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; hoisted out of bb.3.if.end to outside of the loop.
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; Pre Machine LICM MIR
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;
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;body:
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; bb.0.entry:
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; successors: %bb.2.if.then(0x40000000), %bb.3.if.end(0x40000000)
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; liveins: %x3
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;
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; %4 = COPY %x3
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; %5 = ADDIStocHA8 %x2, @ga
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; %6 = LDtocL @ga, killed %5 :: (load 8 from got)
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; %7 = LWZ 0, %6 :: (volatile dereferenceable load 4 from @ga)
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; %8 = ADDIStocHA8 %x2, @gb
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; %9 = LDtocL @gb, killed %8 :: (load 8 from got)
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; %10 = LWZ 0, killed %9 :: (volatile dereferenceable load 4 from @gb)
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; %0 = LWZ 0, %6 :: (volatile dereferenceable load 4 from @ga)
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; %11 = CMPW killed %7, killed %10
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; BCC 44, killed %11, %bb.2.if.then
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; B %bb.3.if.end
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;
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; bb.2.if.then:
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; %1 = PHI %0, %bb.0.entry, %3, %bb.3.if.end
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; ADJCALLSTACKDOWN 32, 0, implicit-def dead %r1, implicit %r1
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; %20 = COPY %x2
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; STD %20, 24, %x1 :: (store 8 into stack + 24)
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; %21 = EXTSW_32_64 %1
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; %x3 = COPY %21
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; %x12 = COPY %4
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; MTCTR8 %4, implicit-def %ctr8
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; BCTRL8_LDinto_toc 24, %x1, csr_ppc64_altivec, implicit-def dead %lr8, implicit-def dead %x2, implicit %ctr8, implicit %rm, implicit %x3, implicit %x12, implicit %x2, implicit-def %r1, implicit-def %x3
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; ADJCALLSTACKUP 32, 0, implicit-def dead %r1, implicit %r1
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; %22 = COPY %x3
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; %x3 = COPY %22
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; BLR8 implicit %lr8, implicit %rm, implicit %x3
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;
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; bb.3.if.end:
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; successors: %bb.2.if.then(0x04000000), %bb.3.if.end(0x7c000000)
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;
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; %2 = PHI %0, %bb.0.entry, %3, %bb.3.if.end
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; %12 = ADDI %2, 1
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; %13 = ADDIStocHA8 %x2, @ga
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; %14 = LDtocL @ga, killed %13 :: (load 8 from got)
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; STW killed %12, 0, %14 :: (volatile store 4 into @ga)
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; %15 = LWZ 0, %14 :: (volatile dereferenceable load 4 from @ga)
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; %16 = ADDIStocHA8 %x2, @gb
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; %17 = LDtocL @gb, killed %16 :: (load 8 from got)
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; %18 = LWZ 0, killed %17 :: (volatile dereferenceable load 4 from @gb)
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; %3 = LWZ 0, %14 :: (volatile dereferenceable load 4 from @ga)
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; %19 = CMPW killed %15, killed %18
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; BCC 44, killed %19, %bb.2.if.then
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; B %bb.3.if.end
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@ga = external global i32, align 4
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@gb = external global i32, align 4
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define signext i32 @test(i32 (i32)* nocapture %FP) local_unnamed_addr #0 {
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; CHECK-LABEL: test:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: mflr 0
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; CHECK: addis 4, 2, .LC0@toc@ha
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; CHECK-NEXT: addis 5, 2, .LC1@toc@ha
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; CHECK-NEXT: mr 12, 3
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; CHECK-NEXT: ld 4, .LC0@toc@l(4)
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; CHECK-NEXT: ld 5, .LC1@toc@l(5)
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; CHECK-NEXT: lwz 6, 0(4)
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; CHECK-NEXT: lwz 7, 0(5)
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; CHECK-NEXT: cmpw 6, 7
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; CHECK-NEXT: lwz 6, 0(4)
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; CHECK-NEXT: bgt 0, .LBB0_2
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; CHECK-NOT: addis {{[0-9]+}}, 2, .LC0@toc@ha
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; CHECK-NOT: addis {{[0-9]+}}, 2, .LC1@toc@ha
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; CHECK-NEXT: .p2align 5
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; CHECK-NEXT: .LBB0_1: # %if.end
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; CHECK-NOT: addis {{[0-9]+}}, 2, .LC0@toc@ha
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; CHECK-NOT: addis {{[0-9]+}}, 2, .LC1@toc@ha
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; CHECK: blr
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entry:
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%0 = load volatile i32, i32* @ga, align 4
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%1 = load volatile i32, i32* @gb, align 4
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%cmp1 = icmp sgt i32 %0, %1
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%2 = load volatile i32, i32* @ga, align 4
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br i1 %cmp1, label %if.then, label %if.end
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if.then: ; preds = %if.end, %entry
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%.lcssa = phi i32 [ %2, %entry ], [ %6, %if.end ]
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%call = tail call signext i32 %FP(i32 signext %.lcssa) #1
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ret i32 %call
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if.end: ; preds = %entry, %if.end
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%3 = phi i32 [ %6, %if.end ], [ %2, %entry ]
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%inc = add nsw i32 %3, 1
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store volatile i32 %inc, i32* @ga, align 4
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%4 = load volatile i32, i32* @ga, align 4
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%5 = load volatile i32, i32* @gb, align 4
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%cmp = icmp sgt i32 %4, %5
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%6 = load volatile i32, i32* @ga, align 4
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br i1 %cmp, label %if.then, label %if.end
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}
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