02ba5b8c6b
No longer conservatively assume a load/store accesses the stack when we can prove that we did not compute any stack-relative address up to this point in the program. We do this in a cheap not-quite-a-dataflow-analysis: Assume `NoStackAddressUsed` when all predecessors of a block already guarantee it. Process blocks in reverse post order to guarantee that except for loop headers we have processed all predecessors of a block before processing the block itself. For loops we accept the conservative answer as they are unlikely to be shrink-wrappable anyway. Differential Revision: https://reviews.llvm.org/D152213
57 lines
1.9 KiB
LLVM
57 lines
1.9 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=arm-none-eabi | FileCheck %s
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%struct.anon.1.19.23.27.35.49.55.57.59.61.89.95 = type { i32, i32 }
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@e = external constant [2 x %struct.anon.1.19.23.27.35.49.55.57.59.61.89.95], align 4
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@f = external global i32, align 4
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define arm_aapcscc void @g() {
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; CHECK-LABEL: g:
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; CHECK: @ %bb.0: @ %entry
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; CHECK-NEXT: ldr r0, .LCPI0_0
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; CHECK-NEXT: mov r2, #0
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; CHECK-NEXT: ldr r1, .LCPI0_1
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; CHECK-NEXT: cmp r2, #0
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; CHECK-NEXT: ldr r0, [r0]
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; CHECK-NEXT: ldr r0, [r1, r0, lsl #3]!
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; CHECK-NEXT: moveq r0, #0
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; CHECK-NEXT: cmp r2, #0
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; CHECK-NEXT: movne pc, lr
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; CHECK-NEXT: .LBB0_1: @ %if.then5
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; CHECK-NEXT: .save {r11, lr}
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; CHECK-NEXT: push {r11, lr}
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; CHECK-NEXT: ldr r1, [r1, #4]
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; CHECK-NEXT: bl k
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; CHECK-NEXT: .p2align 2
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; CHECK-NEXT: @ %bb.2:
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; CHECK-NEXT: .LCPI0_0:
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; CHECK-NEXT: .long f
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; CHECK-NEXT: .LCPI0_1:
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; CHECK-NEXT: .long e
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entry:
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%0 = load i32, ptr @f, align 4
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%c = getelementptr inbounds [2 x %struct.anon.1.19.23.27.35.49.55.57.59.61.89.95], ptr @e, i32 0, i32 %0, i32 0
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%1 = load i32, ptr %c, align 4
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%d = getelementptr inbounds [2 x %struct.anon.1.19.23.27.35.49.55.57.59.61.89.95], ptr @e, i32 0, i32 %0, i32 1
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%2 = load i32, ptr %d, align 4
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br i1 undef, label %land.lhs.true, label %if.end
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land.lhs.true: ; preds = %entry
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br label %if.end
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if.end: ; preds = %land.lhs.true, %entry
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%h.0 = phi i32 [ %1, %entry ], [ 0, %land.lhs.true ]
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br i1 undef, label %if.end7, label %if.then5
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if.then5: ; preds = %if.end
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%call6 = call arm_aapcscc i32 @k(i32 %h.0, i32 %2)
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unreachable
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if.end7: ; preds = %if.end
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ret void
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}
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declare arm_aapcscc i32 @k(...)
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