e6bf48d110
As of revea222be0d, 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 sinceea222be0dbut 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.
51 lines
1.6 KiB
LLVM
51 lines
1.6 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=i686-unknown-unknown | FileCheck %s --check-prefix=X86
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; RUN: llc < %s -mtriple=x86_64-unknown-unknown | FileCheck %s --check-prefix=X64
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@a = common dso_local global i32 0, align 4
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@c = common dso_local local_unnamed_addr global i8 0, align 1
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@b = common dso_local local_unnamed_addr global ptr null, align 8
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define dso_local void @e() {
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; X86-LABEL: e:
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; X86: # %bb.0: # %entry
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; X86-NEXT: movl b, %eax
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; X86-NEXT: .p2align 4
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; X86-NEXT: .LBB0_1: # %for.cond
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; X86-NEXT: # =>This Inner Loop Header: Depth=1
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; X86-NEXT: movzbl c, %ecx
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; X86-NEXT: movb $0, c
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; X86-NEXT: leal a+2(%ecx), %ecx
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; X86-NEXT: movl %ecx, (%eax)
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; X86-NEXT: jmp .LBB0_1
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;
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; X64-LABEL: e:
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; X64: # %bb.0: # %entry
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; X64-NEXT: movq b(%rip), %rax
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; X64-NEXT: .p2align 4
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; X64-NEXT: .LBB0_1: # %for.cond
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; X64-NEXT: # =>This Inner Loop Header: Depth=1
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; X64-NEXT: movzbl c(%rip), %ecx
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; X64-NEXT: addq $a, %rcx
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; X64-NEXT: setb %dl
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; X64-NEXT: addq $2, %rcx
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; X64-NEXT: adcb $0, %dl
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; X64-NEXT: movb %dl, c(%rip)
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; X64-NEXT: movl %ecx, (%rax)
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; X64-NEXT: jmp .LBB0_1
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entry:
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%0 = load ptr, ptr @b, align 8
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br label %for.cond
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for.cond:
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%1 = load i8, ptr @c, align 1
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%conv = zext i8 %1 to i128
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%add = add nuw nsw i128 %conv, add (i128 ptrtoint (ptr @a to i128), i128 2)
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%2 = lshr i128 %add, 64
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%conv1 = trunc i128 %2 to i8
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store i8 %conv1, ptr @c, align 1
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%conv2 = trunc i128 %add to i32
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store i32 %conv2, ptr %0, align 4
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br label %for.cond
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}
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