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fix rdar://9297011 - udiv by power of two causing fast-isel rejects

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129693 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2011-04-18 06:55:51 +00:00
parent 202a7a1e3f
commit 090ca9108b
2 changed files with 13 additions and 1 deletions
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4
lib/CodeGen/SelectionDAG/FastISel.cpp
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@ -990,6 +990,10 @@ unsigned FastISel::FastEmit_ri_(MVT VT, unsigned Opcode,
if (Opcode == ISD::MUL && isPowerOf2_64(Imm)) {
Opcode = ISD::SHL;
Imm = Log2_64(Imm);
} else if (Opcode == ISD::UDIV && isPowerOf2_64(Imm)) {
// div x, 8 -> srl x, 3
Opcode = ISD::SRL;
Imm = Log2_64(Imm);
}
// Horrible hack (to be removed), check to make sure shift amounts are

10
test/CodeGen/X86/fast-isel-x86-64.ll
View File

@ -1,4 +1,4 @@
; RUN: llc < %s -fast-isel -O0 -regalloc=fast -asm-verbose=0 | FileCheck %s
; RUN: llc < %s -fast-isel -O0 -regalloc=fast -asm-verbose=0 -fast-isel-abort | FileCheck %s
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"
target triple = "x86_64-apple-darwin10.0.0"
@ -111,3 +111,11 @@ entry:
; CHECK: test9:
; CHECK: imulq $7, %rdi, %rax
}
; rdar://9297011 - Don't reject udiv by a power of 2.
define i32 @test10(i32 %X) nounwind {
%Y = udiv i32 %X, 8
ret i32 %Y
; CHECK: test10:
; CHECK: shrl $3,
}