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[WebAssembly] Support wasm select operator

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Summary:
Add support for wasm's select operator, and lower LLVM's select DAG node
to it.

Reviewers: sunfish

Subscribers: dschuff, llvm-commits, jfb

Differential Revision: http://reviews.llvm.org/D14295

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@252002 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Derek Schuff 2015-11-03 22:40:40 +00:00
parent 378e661deb
commit 05d7d32e12
3 changed files with 73 additions and 0 deletions
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5
lib/Target/WebAssembly/WebAssemblyInstrFloat.td
View File

@ -58,3 +58,8 @@ def : Pat<(setge f64:$lhs, f64:$rhs), (GE_F64 f64:$lhs, f64:$rhs)>;
* f32.min: minimum (binary operator); if either operand is NaN, returns NaN
* f32.max: maximum (binary operator); if either operand is NaN, returns NaN
*/
def SELECT_F32 : I<(outs F32:$dst), (ins I32:$cond, F32:$lhs, F32:$rhs),
[(set F32:$dst, (select I32:$cond, F32:$lhs, F32:$rhs))]>;
def SELECT_F64 : I<(outs F64:$dst), (ins I32:$cond, F64:$lhs, F64:$rhs),
[(set F64:$dst, (select I32:$cond, F64:$lhs, F64:$rhs))]>;

5
lib/Target/WebAssembly/WebAssemblyInstrInteger.td
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@ -46,3 +46,8 @@ def : Pat<(ctlz_zero_undef I32:$src), (CLZ_I32 I32:$src)>;
def : Pat<(ctlz_zero_undef I64:$src), (CLZ_I64 I64:$src)>;
def : Pat<(cttz_zero_undef I32:$src), (CTZ_I32 I32:$src)>;
def : Pat<(cttz_zero_undef I64:$src), (CTZ_I64 I64:$src)>;
def SELECT_I32 : I<(outs I32:$dst), (ins I32:$cond, I32:$lhs, I32:$rhs),
[(set I32:$dst, (select I32:$cond, I32:$lhs, I32:$rhs))]>;
def SELECT_I64 : I<(outs I64:$dst), (ins I32:$cond, I64:$lhs, I64:$rhs),
[(set I64:$dst, (select I32:$cond, I64:$lhs, I64:$rhs))]>;

63
test/CodeGen/WebAssembly/select.ll Normal file
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@ -0,0 +1,63 @@
; RUN: llc < %s -asm-verbose=false | FileCheck %s
; RUN: llc < %s -asm-verbose=false -fast-isel | FileCheck %s
; Test that wasm select instruction is selected from LLVM select instruction.
target datalayout = "e-p:32:32-i64:64-n32:64-S128"
target triple = "wasm32-unknown-unknown"
;; CHECK-LABEL: select_i32:
;; CHECK: get_local 1
;; CHECK: set_local [[LOCAL_B:[0-9]]]
;; CHECK: get_local 0
;; CHECK: set_local [[LOCAL_A:[0-9]]]
;; CHECK: i32.eq (get_local 5), (get_local 6)
;; CHECK: set_local 7, pop
;; CHECK: i32.select (get_local 7), (get_local [[LOCAL_A]]), (get_local [[LOCAL_B]])
define i32 @select_i32(i32 %a, i32 %b, i32 %cond) {
%cc = icmp eq i32 %cond, 0
%result = select i1 %cc, i32 %a, i32 %b
ret i32 %result
}
;; CHECK-LABEL: select_i64:
;; CHECK: get_local 1
;; CHECK: set_local [[LOCAL_B:[0-9]]]
;; CHECK: get_local 0
;; CHECK: set_local [[LOCAL_A:[0-9]]]
;; CHECK: i32.eq (get_local 5), (get_local 6)
;; CHECK: set_local 7, pop
;; CHECK: i64.select (get_local 7), (get_local [[LOCAL_A]]), (get_local [[LOCAL_B]])
define i64 @select_i64(i64 %a, i64 %b, i32 %cond) {
%cc = icmp eq i32 %cond, 0
%result = select i1 %cc, i64 %a, i64 %b
ret i64 %result
}
;; CHECK-LABEL: select_f32:
;; CHECK: get_local 1
;; CHECK: set_local [[LOCAL_B:[0-9]]]
;; CHECK: get_local 0
;; CHECK: set_local [[LOCAL_A:[0-9]]]
;; CHECK: i32.eq (get_local 5), (get_local 6)
;; CHECK: set_local 7, pop
;; CHECK: f32.select (get_local 7), (get_local [[LOCAL_A]]), (get_local [[LOCAL_B]])
define float @select_f32(float %a, float %b, i32 %cond) {
%cc = icmp eq i32 %cond, 0
%result = select i1 %cc, float %a, float %b
ret float %result
}
;; CHECK-LABEL: select_f64:
;; CHECK: get_local 1
;; CHECK: set_local [[LOCAL_B:[0-9]]]
;; CHECK: get_local 0
;; CHECK: set_local [[LOCAL_A:[0-9]]]
;; CHECK: i32.eq (get_local 5), (get_local 6)
;; CHECK: set_local 7, pop
;; CHECK: f64.select (get_local 7), (get_local [[LOCAL_A]]), (get_local [[LOCAL_B]])
define double @select_f64(double %a, double %b, i32 %cond) {
%cc = icmp eq i32 %cond, 0
%result = select i1 %cc, double %a, double %b
ret double %result
}