3787ee4571
Relands commit 433c8d950c with fixes for
MIPS.
Similar to D102742, specifying the stack alignment via CodegenOpts means
that this flag gets dropped during LTO, unless the command line is
re-specified as a plugin opt. Instead, encode this information as a
module level attribute so that we don't have to expose this llvm
internal flag when linking the Linux kernel with LTO.
Looks like external dependencies might need a fix:
* https://github.com/llvm-hs/llvm-hs/issues/345
* https://github.com/halide/Halide/issues/6079
Link: https://github.com/ClangBuiltLinux/linux/issues/1377
Reviewed By: tejohnson
Differential Revision: https://reviews.llvm.org/D103048
53 lines
1.4 KiB
LLVM
53 lines
1.4 KiB
LLVM
; RUN: llc < %s -mtriple=i686-windows -stackrealign | FileCheck %s
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declare void @good(i32 %a, i32 %b, i32 %c, i32 %d)
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declare void @oneparam(i32 %a)
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declare void @eightparams(i32 %a, i32 %b, i32 %c, i32 %d, i32 %e, i32 %f, i32 %g, i32 %h)
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; When there is no reserved call frame, check that additional alignment
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; is added when the pushes don't add up to the required alignment.
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; CHECK-LABEL: test5:
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; CHECK: subl $16, %esp
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; CHECK-NEXT: pushl $4
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; CHECK-NEXT: pushl $3
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; CHECK-NEXT: pushl $2
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; CHECK-NEXT: pushl $1
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; CHECK-NEXT: call
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define void @test5(i32 %k) {
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entry:
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%a = alloca i32, i32 %k
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call void @good(i32 1, i32 2, i32 3, i32 4)
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ret void
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}
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; When the alignment adds up, do the transformation
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; CHECK-LABEL: test5b:
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; CHECK: pushl $8
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; CHECK-NEXT: pushl $7
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; CHECK-NEXT: pushl $6
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; CHECK-NEXT: pushl $5
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; CHECK-NEXT: pushl $4
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; CHECK-NEXT: pushl $3
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; CHECK-NEXT: pushl $2
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; CHECK-NEXT: pushl $1
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; CHECK-NEXT: call
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define void @test5b() optsize {
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entry:
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call void @eightparams(i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7, i32 8)
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ret void
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}
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; When having to compensate for the alignment isn't worth it,
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; don't use pushes.
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; CHECK-LABEL: test5c:
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; CHECK: movl $1, (%esp)
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; CHECK-NEXT: call
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define void @test5c() optsize {
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entry:
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call void @oneparam(i32 1)
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ret void
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}
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!llvm.module.flags = !{!0}
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!0 = !{i32 2, !"override-stack-alignment", i32 32}
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