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.
52 lines
1.5 KiB
LLVM
52 lines
1.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=i686-- | FileCheck %s
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define fastcc i32 @_Z18yy_get_next_bufferv() nounwind {
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; CHECK-LABEL: _Z18yy_get_next_bufferv:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: movl $42, %eax
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; CHECK-NEXT: cmpl $-1, %eax
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; CHECK-NEXT: je .LBB0_3
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; CHECK-NEXT: .p2align 4
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; CHECK-NEXT: .LBB0_1: # %bb116
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; CHECK-NEXT: # =>This Inner Loop Header: Depth=1
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; CHECK-NEXT: movb %al, 0
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; CHECK-NEXT: cmpl $-1, %eax
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; CHECK-NEXT: jne .LBB0_1
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; CHECK-NEXT: .LBB0_3: # %bb158
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; CHECK-NEXT: movb %al, 0
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; CHECK-NEXT: xorl %eax, %eax
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; CHECK-NEXT: retl
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entry:
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br label %bb131
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bb116: ; preds = %bb131
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%tmp125126 = trunc i32 %c.1 to i8 ; <i8> [#uses=1]
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store i8 %tmp125126, ptr null, align 1
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br label %bb131
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bb131: ; preds = %bb116, %entry
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%c.2 = phi i32 [ %c.1, %bb116 ], [ 42, %entry ] ; <i32> [#uses=1]
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%c.1 = select i1 false, i32 0, i32 %c.2 ; <i32> [#uses=4]
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%tmp181 = icmp eq i32 %c.1, -1 ; <i1> [#uses=1]
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br i1 %tmp181, label %bb158, label %bb116
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bb158: ; preds = %bb131
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br i1 true, label %cond_true163, label %cond_next178
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cond_true163: ; preds = %bb158
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%tmp172173 = trunc i32 %c.1 to i8 ; <i8> [#uses=1]
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store i8 %tmp172173, ptr null, align 1
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br label %cond_next178
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cond_next178: ; preds = %cond_true163, %bb158
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%tmp180 = icmp eq i32 %c.1, -1 ; <i1> [#uses=1]
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br i1 %tmp180, label %cond_next184, label %cond_next199
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cond_next184: ; preds = %cond_next178
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ret i32 0
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cond_next199: ; preds = %cond_next178
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ret i32 0
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}
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