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https://github.com/c64scene-ar/llvm-6502.git
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e0c2787cb7
This commit is debatable. There are two possible approaches, neither of which is really satisfactory: 1. Use "@foo(i1 zeroext)" to mean an extension to 32-bits on Darwin, and 8 bits otherwise. 2. Redefine "@foo(i1)" to mean that the i1 is extended by the caller to 8 bits. This goes against the spirit of "zeroext" I think, but it's a bit of a vague construct anyway (by definition you're going to extend to the amount required by the ABI, that's why it's the ABI!). This implements option 2. The DAG machinery really isn't setup for the first (there's a fairly strong assumption that "zeroext" goes to at least the smallest register size), and even if it was the resulting DAG looks like it would be inferior in many cases. Theoretically we could add AssertZext nodes in the consumers of ABI-passed values too now, but this actually seems to make the code worse in practice by making truncation proceed in two steps. The code produced is equally valid if we continue to assume only the low bit is defined. Should fix PR19850 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209637 91177308-0d34-0410-b5e6-96231b3b80d8
56 lines
1.5 KiB
LLVM
56 lines
1.5 KiB
LLVM
; RUN: llc -mtriple=aarch64-linux-gnu -o - %s | FileCheck %s
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%big = type i32
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@var = global %big 0
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; AAPCS: low 8 bits of %in (== w0) will be either 0 or 1. Need to extend to
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; 32-bits.
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define void @consume_i1_arg(i1 %in) {
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; CHECK-LABEL: consume_i1_arg:
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; CHECK: and [[BOOL32:w[0-9]+]], w0, #{{0x1|0xff}}
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; CHECK: str [[BOOL32]], [{{x[0-9]+}}, :lo12:var]
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%val = zext i1 %in to %big
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store %big %val, %big* @var
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ret void
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}
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; AAPCS: low 8 bits of %val1 (== w0) will be either 0 or 1. Need to extend to
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; 32-bits (doesn't really matter if it's from 1 or 8 bits).
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define void @consume_i1_ret() {
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; CHECK-LABEL: consume_i1_ret:
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; CHECK: bl produce_i1_ret
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; CHECK: and [[BOOL32:w[0-9]+]], w0, #{{0x1|0xff}}
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; CHECK: str [[BOOL32]], [{{x[0-9]+}}, :lo12:var]
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%val1 = call i1 @produce_i1_ret()
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%val = zext i1 %val1 to %big
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store %big %val, %big* @var
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ret void
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}
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; AAPCS: low 8 bits of w0 must be either 0 or 1. Need to mask them off.
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define i1 @produce_i1_ret() {
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; CHECK-LABEL: produce_i1_ret:
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; CHECK: ldr [[VAR32:w[0-9]+]], [{{x[0-9]+}}, :lo12:var]
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; CHECK: and w0, [[VAR32]], #{{0x1|0xff}}
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%val = load %big* @var
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%val1 = trunc %big %val to i1
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ret i1 %val1
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}
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define void @produce_i1_arg() {
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; CHECK-LABEL: produce_i1_arg:
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; CHECK: ldr [[VAR32:w[0-9]+]], [{{x[0-9]+}}, :lo12:var]
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; CHECK: and w0, [[VAR32]], #{{0x1|0xff}}
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; CHECK: bl consume_i1_arg
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%val = load %big* @var
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%val1 = trunc %big %val to i1
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call void @consume_i1_arg(i1 %val1)
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ret void
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}
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;define zeroext i1 @foo(i8 %in) {
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; %val = trunc i8 %in to i1
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; ret i1 %val
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;}
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