027c16bef4
When building 32b x86 code as PIC, the existing handling of "i"
constraints is conservative since generally we have to go through the
GOT to find references to functions.
But generally, BlockAddresses from C code refer to the Function in the
current TU. Permit BlockAddresses to be used with the "i" constraint
for those cases.
I regressed this in
commit 4edb9983cb ("[SelectionDAG] treat X constrained labels as i for asm")
Fixes: https://github.com/llvm/llvm-project/issues/53868
Reviewed By: efriedma, MaskRay
Differential Revision: https://reviews.llvm.org/D119905
59 lines
1.7 KiB
LLVM
59 lines
1.7 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=i386-apple-darwin -relocation-model=pic | FileCheck %s
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@main_q = internal global i8* null ; <i8**> [#uses=1]
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define void @func2() nounwind {
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; CHECK-LABEL: func2:
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; CHECK: ## %bb.0: ## %entry
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; CHECK-NEXT: calll L0$pb
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; CHECK-NEXT: L0$pb:
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; CHECK-NEXT: popl %eax
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; CHECK-NEXT: leal _main_q-L0$pb(%eax), %eax
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; CHECK-NEXT: ## InlineAsm Start
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; CHECK-NEXT: movl %eax, %gs:152
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; CHECK-NEXT: ## InlineAsm End
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; CHECK-NEXT: retl
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entry:
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tail call void asm "mov $1,%gs:$0", "=*m,ri,~{dirflag},~{fpsr},~{flags}"(i8** elementtype(i8*) inttoptr (i32 152 to i8**), i8* bitcast (i8** @main_q to i8*)) nounwind
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ret void
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}
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; The intent of this test is to ensure that we handle blockaddress' correctly
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; with "i" constraints for -m32 -fPIC.
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define void @x() {
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; CHECK-LABEL: x:
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; CHECK: ## %bb.0:
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; CHECK-NEXT: ## InlineAsm Start
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; CHECK-NEXT: ## Ltmp0
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; CHECK-EMPTY:
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; CHECK-NEXT: ## InlineAsm End
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; CHECK-NEXT: ## %bb.2: ## %return
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; CHECK-NEXT: retl
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; CHECK-NEXT: Ltmp0: ## Block address taken
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; CHECK-NEXT: LBB1_1: ## %overflow
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; CHECK-NEXT: retl
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callbr void asm "# ${0:l}\0A", "i"(i8* blockaddress(@x, %overflow))
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to label %return [label %overflow]
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overflow:
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br label %return
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return:
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ret void
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}
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; Test unusual case of blockaddress from @x in @y's asm.
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define void @y() {
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; CHECK-LABEL: y:
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; CHECK: ## %bb.0:
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; CHECK-NEXT: ## InlineAsm Start
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; CHECK-NEXT: ## Ltmp0
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; CHECK-EMPTY:
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; CHECK-NEXT: ## InlineAsm End
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; CHECK-NEXT: retl
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call void asm "# ${0:l}\0A", "i"(i8* blockaddress(@x, %overflow))
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ret void
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}
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