2010-08-27 00:23:39 +02:00
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; RUN: opt < %s -instcombine -S | FileCheck %s
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2010-08-27 22:32:06 +02:00
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
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2009-06-18 01:17:05 +02:00
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2009-06-18 18:30:21 +02:00
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; Instcombine should be able to eliminate all of these ext casts.
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2009-06-18 01:17:05 +02:00
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declare void @use(i32)
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2010-08-27 00:23:39 +02:00
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define i64 @test1(i64 %a) {
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2009-06-18 01:17:05 +02:00
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%b = trunc i64 %a to i32
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%c = and i32 %b, 15
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%d = zext i32 %c to i64
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call void @use(i32 %b)
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ret i64 %d
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2010-08-27 00:23:39 +02:00
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; CHECK: @test1
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; CHECK: %d = and i64 %a, 15
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; CHECK: ret i64 %d
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2009-06-18 01:17:05 +02:00
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}
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2010-08-27 00:23:39 +02:00
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define i64 @test2(i64 %a) {
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2009-06-18 01:17:05 +02:00
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%b = trunc i64 %a to i32
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%c = shl i32 %b, 4
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%q = ashr i32 %c, 4
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%d = sext i32 %q to i64
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call void @use(i32 %b)
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ret i64 %d
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2010-08-27 00:23:39 +02:00
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; CHECK: @test2
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; CHECK: shl i64 %a, 36
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; CHECK: %d = ashr i64 {{.*}}, 36
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; CHECK: ret i64 %d
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2009-06-18 01:17:05 +02:00
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}
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2010-08-27 00:23:39 +02:00
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define i64 @test3(i64 %a) {
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2009-06-18 18:30:21 +02:00
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%b = trunc i64 %a to i32
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%c = and i32 %b, 8
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%d = zext i32 %c to i64
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call void @use(i32 %b)
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ret i64 %d
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2010-08-27 00:23:39 +02:00
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; CHECK: @test3
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; CHECK: %d = and i64 %a, 8
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; CHECK: ret i64 %d
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2009-06-18 18:30:21 +02:00
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}
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2010-08-27 00:23:39 +02:00
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define i64 @test4(i64 %a) {
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2009-06-18 18:30:21 +02:00
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%b = trunc i64 %a to i32
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%c = and i32 %b, 8
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%x = xor i32 %c, 8
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%d = zext i32 %x to i64
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call void @use(i32 %b)
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ret i64 %d
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2010-08-27 00:23:39 +02:00
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; CHECK: @test4
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; CHECK: = and i64 %a, 8
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; CHECK: %d = xor i64 {{.*}}, 8
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; CHECK: ret i64 %d
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2009-06-18 18:30:21 +02:00
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}
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Add an instcombine to clean up a common pattern produced
by the SRoA "promote to large integer" code, eliminating
some type conversions like this:
%94 = zext i16 %93 to i32 ; <i32> [#uses=2]
%96 = lshr i32 %94, 8 ; <i32> [#uses=1]
%101 = trunc i32 %96 to i8 ; <i8> [#uses=1]
This also unblocks other xforms from happening, now clang is able to compile:
struct S { float A, B, C, D; };
float foo(struct S A) { return A.A + A.B+A.C+A.D; }
into:
_foo: ## @foo
## BB#0: ## %entry
pshufd $1, %xmm0, %xmm2
addss %xmm0, %xmm2
movdqa %xmm1, %xmm3
addss %xmm2, %xmm3
pshufd $1, %xmm1, %xmm0
addss %xmm3, %xmm0
ret
on x86-64, instead of:
_foo: ## @foo
## BB#0: ## %entry
movd %xmm0, %rax
shrq $32, %rax
movd %eax, %xmm2
addss %xmm0, %xmm2
movapd %xmm1, %xmm3
addss %xmm2, %xmm3
movd %xmm1, %rax
shrq $32, %rax
movd %eax, %xmm0
addss %xmm3, %xmm0
ret
This seems pretty close to optimal to me, at least without
using horizontal adds. This also triggers in lots of other
code, including SPEC.
llvm-svn: 112278
2010-08-27 20:31:05 +02:00
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define i32 @test5(i32 %A) {
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%B = zext i32 %A to i128
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%C = lshr i128 %B, 16
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%D = trunc i128 %C to i32
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ret i32 %D
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; CHECK: @test5
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; CHECK: %C = lshr i32 %A, 16
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; CHECK: ret i32 %C
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}
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define i32 @test6(i64 %A) {
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%B = zext i64 %A to i128
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%C = lshr i128 %B, 32
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%D = trunc i128 %C to i32
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ret i32 %D
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; CHECK: @test6
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; CHECK: %C = lshr i64 %A, 32
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; CHECK: %D = trunc i64 %C to i32
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; CHECK: ret i32 %D
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}
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define i92 @test7(i64 %A) {
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%B = zext i64 %A to i128
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%C = lshr i128 %B, 32
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%D = trunc i128 %C to i92
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ret i92 %D
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; CHECK: @test7
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2010-08-27 22:32:06 +02:00
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; CHECK: %B = zext i64 %A to i92
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; CHECK: %C = lshr i92 %B, 32
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; CHECK: ret i92 %C
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}
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define i64 @test8(i32 %A, i32 %B) {
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%tmp38 = zext i32 %A to i128
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%tmp32 = zext i32 %B to i128
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%tmp33 = shl i128 %tmp32, 32
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%ins35 = or i128 %tmp33, %tmp38
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%tmp42 = trunc i128 %ins35 to i64
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ret i64 %tmp42
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; CHECK: @test8
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; CHECK: %tmp38 = zext i32 %A to i64
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; CHECK: %tmp32 = zext i32 %B to i64
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; CHECK: %tmp33 = shl i64 %tmp32, 32
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; CHECK: %ins35 = or i64 %tmp33, %tmp38
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; CHECK: ret i64 %ins35
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}
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