e6bf48d110
As of rev ea222be0d, LLVMs assembler will actually try to honour the "fill value" part of p2align directives. X86 printed these as 0x90, which isn't actually what it wanted: we want multi-byte nops for .text padding. Compiling via a textual assembly file produces single-byte nop padding since ea222be0d but the built-in assembler will produce multi-byte nops. This divergent behaviour is undesirable. To fix: don't set the byte padding field for x86, which allows the assembler to pick multi-byte nops. Test that we get the same multi-byte padding when compiled via textual assembly or directly to object file. Added same-align-bytes-with-llasm-llobj.ll to that effect, updated numerous other tests to not contain check-lines for the explicit padding.
40 lines
1.3 KiB
LLVM
40 lines
1.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=x86_64-unknown-unknown | FileCheck %s
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; Reported on D129765
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define void @simplify_assertzext(ptr %0) {
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; CHECK-LABEL: simplify_assertzext:
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; CHECK: # %bb.0: # %BB
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; CHECK-NEXT: movl $275047, %eax # imm = 0x43267
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; CHECK-NEXT: movb $1, %cl
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; CHECK-NEXT: .p2align 4
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; CHECK-NEXT: .LBB0_1: # %CF246
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; CHECK-NEXT: # =>This Inner Loop Header: Depth=1
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; CHECK-NEXT: testb %cl, %cl
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; CHECK-NEXT: jne .LBB0_1
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; CHECK-NEXT: # %bb.2: # %CF260
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; CHECK-NEXT: orl $278403, %eax # imm = 0x43F83
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; CHECK-NEXT: movl %eax, (%rdi)
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; CHECK-NEXT: .p2align 4
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; CHECK-NEXT: .LBB0_3: # %CF242
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; CHECK-NEXT: # =>This Inner Loop Header: Depth=1
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; CHECK-NEXT: jmp .LBB0_3
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BB:
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br label %CF246
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CF246: ; preds = %CF246, %BB
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%Sl23 = select i1 true, i32 275047, i32 355835
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%Cmp24 = fcmp ule float 0x3841668540000000, undef
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br i1 %Cmp24, label %CF246, label %CF260
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CF260: ; preds = %CF246
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%B29 = or i32 %Sl23, 278403
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store i32 %B29, ptr %0, align 4
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%L40 = load <4 x i1>, ptr %0, align 1
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br label %CF242
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CF242: ; preds = %CF242, %CF260
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%Sl53 = select i1 undef, <4 x i1> %L40, <4 x i1> undef
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br label %CF242
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}
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