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Add support for RDRAND in IvyBridge.

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The standard library now provides a variety of rdrand() functions
that call out to RDRAND, when available.

Issue #263.
This commit is contained in:
Matt Pharr
2012-07-12 06:07:07 -07:00
parent 2bacebb1fb
commit 2c640f7e52
19 changed files with 525 additions and 6 deletions
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45
builtins/util.m4
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@@ -3712,3 +3712,48 @@ define void @__scatter64_$1(<WIDTH x i64> %ptrs, <WIDTH x $1> %values,
'
)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; rdrand
define(`rdrand_decls', `
declare i1 @__rdrand_i16(i16 * nocapture)
declare i1 @__rdrand_i32(i32 * nocapture)
declare i1 @__rdrand_i64(i64 * nocapture)
')
define(`rdrand_definition', `
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; rdrand
declare {i16, i32} @llvm.x86.rdrand.16()
declare {i32, i32} @llvm.x86.rdrand.32()
declare {i64, i32} @llvm.x86.rdrand.64()
define i1 @__rdrand_i16(i16 * %ptr) {
%v = call {i16, i32} @llvm.x86.rdrand.16()
%v0 = extractvalue {i16, i32} %v, 0
%v1 = extractvalue {i16, i32} %v, 1
store i16 %v0, i16 * %ptr
%good = icmp ne i32 %v1, 0
ret i1 %good
}
define i1 @__rdrand_i32(i32 * %ptr) {
%v = call {i32, i32} @llvm.x86.rdrand.32()
%v0 = extractvalue {i32, i32} %v, 0
%v1 = extractvalue {i32, i32} %v, 1
store i32 %v0, i32 * %ptr
%good = icmp ne i32 %v1, 0
ret i1 %good
}
define i1 @__rdrand_i64(i64 * %ptr) {
%v = call {i64, i32} @llvm.x86.rdrand.64()
%v0 = extractvalue {i64, i32} %v, 0
%v1 = extractvalue {i64, i32} %v, 1
store i64 %v0, i64 * %ptr
%good = icmp ne i32 %v1, 0
ret i1 %good
}
')