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39a4281deb
When choosing between constraints with multiple options,
like "ir", test to see if we can use the 'i' constraint and
go with that if possible. This produces more optimal ASM in
all cases (sparing a register and an instruction to load it),
and fixes inline asm like this:
void test () {
asm volatile (" %c0 %1 " : : "imr" (42), "imr"(14));
}
Previously we would dump "42" into a memory location (which
is ok for the 'm' constraint) which would cause a problem
because the 'c' modifier is not valid on memory operands.
Isn't it great how inline asm turns 'missed optimization'
into 'compile failed'??
Incidentally, this was the todo in
PowerPC/2007-04-24-InlineAsm-I-Modifier.ll
Please do NOT pull this into Tak.
llvm-svn: 50315
12 lines
418 B
LLVM
12 lines
418 B
LLVM
; RUN: llvm-as < %s | llc | grep {1 \$2 3}
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; rdar://5720231
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
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target triple = "i386-apple-darwin8"
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define void @test() nounwind {
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entry:
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tail call void asm sideeffect " ${0:c} $1 ${2:c} ", "imr,imr,i,~{dirflag},~{fpsr},~{flags}"( i32 1, i32 2, i32 3 ) nounwind
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ret void
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}
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