max

Maximum

This instruction is defined by:

Encoding

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Synopsis

Returns the larger of two signed integers.

Software Hint
Calculating the absolute value of a signed integer can be performed using the following sequence: neg rD,rS followed by `max rD,rS,rD. When using this common sequence, it is suggested that they are scheduled with no intervening instructions so that implementations that are so optimized can fuse them together.

Access

M HS U VS VU

Always

Always

Always

Always

Always

Decode Variables

Bits<5> xs2 = $encoding[24:20];
Bits<5> xs1 = $encoding[19:15];
Bits<5> xd = $encoding[11:7];

Execution

  • Pruned, XLEN == 64

  • Original

X[xd] = ($signed(X[xs1]) > $signed(X[xs2])) ? X[xs1] : X[xs2];
X[xd] = ($signed(X[xs1]) > $signed(X[xs2])) ? X[xs1] : X[xs2];